The crystal structures of W2Ir3B6−x(x≈1) and Mo2IrB2have been derived by means of single crystal photographs. Mo2.5Ir2.5B5is isotypic with W2Ir3B6−x, displays a more statistical distribution, however, of the two kind of metal atoms. In Mo2IrB2there are B4-groups present. (Cr,Ru)B as well as (Cr,Os)B crystallize with FeB-type structure, (Mo,Ru)B with CrB-type structure and (Mo,Ru)3B4is isotypic with Ta3B4. The principles of the structural chemistry of binary and ternary borides within the range of 40–60 at. boron will be di
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